Lab02 - AOS 311 Lab 2: Using GEMPAK Objective: Become...

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AOS 311 Lab 2: Using GEMPAK Objective: Become comfortable with using the GE neral M eteorological PA c K age in a UNIX environment. Use GEMPAK plots to comment on the structure of a mid-latitude cyclone. Motivation: GEMPAK is an important and useful tool for studying geophysical fluid dynamics. Becoming familiar with its implementation now will be useful in the future when you are asked to perform case studies of everything from winter cyclones to tornado outbreaks. Beyond simply becoming comfortable with a new tool, knowledge of GEMPAK will give you the ability to investigate meteorological phenomena from the perspective of a scientist – that is, you won’t have to rely on other people to provide you with plots. GEMPAK allows you to plot all kinds of variables that wouldn’t necessarily be available elsewhere, and you can even plot variables you invent yourself. GEMPAK is a major component of many research projects going on in this building right now. Assignment: Since this is probably your first time using GEMPAK, and perhaps the first time you’ve ever used a UNIX operating system, the commands you need to input into the program to complete the assignment are given to you. Simply follow the instructions here, and you should end up with the desired plots. It is essentially up to you to learn how to use this program – this lab is just a tutorial. I would highly recommend that you spend any free time you have in the lab figuring out other plots, looking at other levels or times, and looking at the help pages. However, for this lab, you will be asked to look at a few plots, describe what you see, and print out some plots for analysis. For those specific tasks, the step-by-step commands will be given to you. Running a GEMPAK program Log into a computer and bring up a new terminal. We are going to be restricting ourselves to a single program, GDPLOT, which is able to plot multiple contours and vectors from a gridded data set. To start the program, simply type ‘gdplot’ into the terminal and press enter. You should end up with a long list of variables, with a prompt at the end that says GEMPAK-GDPLOT>. In a GEMPAK program like GDPLOT, you set up plots by typing commands directly into the command prompt. There is no graphical-user- interface, so no buttons are pressed, and the mouse is used very little.
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List of GDPLOT variables that must be set (bolded variables are used most often): GDFILE – This is the name of the data file that you are using. All GEMPAK data files use a proprietary data format, and have ‘.gem’ at the end of the name. GDATTIM – The date and time for a plot. Many data files have data over a wide range of dates and times, so you must specify the appropriate time here. GLEVEL
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This lab report was uploaded on 03/27/2008 for the course ATM OCN 311 taught by Professor Deweaver during the Spring '08 term at University of Wisconsin.

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Lab02 - AOS 311 Lab 2: Using GEMPAK Objective: Become...

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